1. Hierarchical Particle-In-Quasicavity Architecture for Ultratrace In Situ Raman Sensing and Its Application in Real-Time Monitoring of Toxic Pollutants
- Author
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Maosen Yang, Zhen Li, Chundong Liu, Yisheng Wei, Fengcai Lei, Chao Zhang, Jing Yu, and Baoyuan Man
- Subjects
Pollutant ,Detection limit ,In situ ,010401 analytical chemistry ,Nanotechnology ,Optical field ,010402 general chemistry ,01 natural sciences ,Signal ,0104 chemical sciences ,Analytical Chemistry ,Rhodamine 6G ,symbols.namesake ,chemistry.chemical_compound ,chemistry ,symbols ,Particle ,Raman spectroscopy - Abstract
Unstable detection environment is one of the biggest interferences for in situ surface-enhanced Raman spectroscopy (SERS) using in real-time monitoring of toxic pollutants, leading to unreliable results. To address this problem, we have designed and prepared a cavity-based particle-in-quasicavity (PIQC) architecture composed of hierarchical ZnO/Ag nanosheets and nanoprotrusions for improving the in situ SERS performance under a liquid environment. Benefitting from the special cascaded optical field mode, the PIQC ZnO/Ag exhibits excellent in situ SERS detectability, with 10-18 M of limit of detection for rhodamine 6G and 12.8% of signal relative standard deviation value. Furthermore, by means of a microfluidic chip, this PIQC structure is proved to have the quantitative analysis feasibility and realizes real-time monitoring of the 3,3',4,4'-tetrachlorobiphenyl, a representative global environmental hazard, under the flowing environment. The strategy in this paper provides a brand new idea to promote the application of in situ SERS in contaminant monitoring and is also instructive for light control in other optical fields.
- Published
- 2020